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Robert earned scores of 81, 93, 76, and 78 on four English tests. Determine his score on the fifth test if his average for the five tests was 85

 Mar 23, 2020
 #1
avatar+111330 
+2

Note  that if  his  average  was  85  he must  have  85 * 5   = 425  total points

 

So  his score on the  fifth test  was

 

425 - ( 81 + 93 + 76 + 78)    =   97

 

 

cool cool cool

 Mar 23, 2020
 #2
avatar+23710 
+1

(81+93+76+78 + x) / 5  = 85     solve for 'x'

 Mar 23, 2020
 #3
avatar+1970 
+1

Nice, both of you!

CalTheGreat  Mar 23, 2020

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